Borders of Canada
The borders of Canada include: To the south and west: An international boundary with the United States, forming the longest shared border in the world, 8,893 km (5,526 mi); (Informally referred as the 49th parallel north which makes up the boundary at parts. To the east: A maritime boundary with the Kingdom of Denmark, at the self-autonomous territory of Greenland; and a smaller land-based border on divided Hans Island.